CSEDI Collaborative Research: Valence state of iron in the lower mantle
CSEDI合作研究:下地幔铁的价态
基本信息
- 批准号:1316022
- 负责人:
- 金额:$ 6.94万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2012
- 资助国家:美国
- 起止时间:2012-10-01 至 2015-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The redox state controls many important chemical reactions in natural systems, including the reactions in the deep interior of the Earth. The oxidation state of iron has been extensively used to infer the redox state. It has been well understood that the upper mantle has reducing redox conditions and thermodynamic studies have predicted even more reducing conditions in the lower mantle. However, recent studies at pressure-temperature conditions related to the topmost lower mantle have shown that about 60% of iron in the dominant lower-mantle mineral, magnesium silicate perovskite, is ferric. This is very surprising because only 2% of iron is ferric in upper-mantle minerals. If this result is extrapolated to the deep lower mantle, it would imply that the lower mantle is chemically distinct from the upper mantle, which may conflict with recent seismic tomography evidence of mixing between the upper and lower mantle. Our preliminary work showed that the oxidation state of iron in mantle silicate perovskite is strongly coupled with the electronic configuration of iron at high pressure. As recent studies have shown that the electronic configuration of iron in mantle minerals changes with depth, our preliminary work implies that the oxidation state of iron may change with depth as well. In addition, aluminum in silicate perovskite can influence the oxidation state of iron. In this project, we will combine experiment (Shim) and theory (Morgan) to measure how the oxidation state of iron in lower-mantle silicate perovskite changes with depth and composition. In the experimental effort, we will measure the oxidation state of iron by controlling the redox state of the sample chamber to that of the lower mantle at high pressure-temperature. We use ab-initio based techniques, which solve the fundamental quantum mechanical equations for the material, to predict reaction energies and volumes as a function of composition, pressure, and temperature. This joint effort will provide graduate students and postdocs with new opportunities to combine experimental and theoretical approaches.
氧化还原状态控制着自然系统中许多重要的化学反应,包括地球内部深处的反应。 铁的氧化态已被广泛用于推断氧化还原状态。 上地幔具有还原性氧化还原条件,热力学研究预测下地幔具有更多的还原性条件。 然而,最近的研究表明,在与下地幔顶部有关的压力-温度条件下,下地幔主要矿物硅酸镁钙钛矿中约60%的铁是三价铁。 这是非常令人惊讶的,因为在上地幔矿物中只有2%的铁是三价铁。 如果将这一结果外推到下地幔深部,则意味着下地幔与上地幔在化学上是不同的,这可能与最近的地震层析成像证据相冲突。 我们的初步工作表明,地幔硅酸盐钙钛矿中铁的氧化态与高压下铁的电子构型强烈耦合。 最近的研究表明,地幔矿物中铁的电子构型随深度而变化,我们的初步工作意味着铁的氧化态也可能随深度而变化。 此外,硅酸盐钙钛矿中的铝可以影响铁的氧化态。 在这个项目中,我们将结合联合收割机实验(Shim)和理论(Morgan)来测量下地幔硅酸盐钙钛矿中铁的氧化态如何随深度和成分而变化。 在实验工作中,我们将通过控制样品室的氧化还原状态来测量铁的氧化态,以在高压-温度下测量下地幔的氧化态。我们使用基于从头算的技术,解决材料的基本量子力学方程,预测反应能量和体积作为组成,压力和温度的函数。 这一共同努力将为研究生和博士后提供新的机会,联合收割机结合实验和理论的方法。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
数据更新时间:{{ journalArticles.updateTime }}
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
数据更新时间:{{ journalArticles.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ monograph.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ sciAawards.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ conferencePapers.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ patent.updateTime }}
Sang-Heon Shim其他文献
Continent-sized anomalous zones with low seismic velocity at the base of Earth's mantle
地幔底部具有低地震波速的大陆规模异常区
- DOI:
10.1038/ngeo2733 - 发表时间:
2016-06-20 - 期刊:
- 影响因子:16.100
- 作者:
Edward J. Garnero;Allen K. McNamara;Sang-Heon Shim - 通讯作者:
Sang-Heon Shim
Post-perovskite at ten
后钙钛矿在十
- DOI:
10.1038/ngeo2237 - 发表时间:
2014-08-28 - 期刊:
- 影响因子:16.100
- 作者:
Sang-Heon Shim;Thorne Lay - 通讯作者:
Thorne Lay
Raman spectroscopy and x-ray diffraction of phase transitions in Cr 2 O 3 to 61 GPa
- DOI:
10.1103/physrevb.69.144107 - 发表时间:
2004-04 - 期刊:
- 影响因子:3.7
- 作者:
Sang-Heon Shim - 通讯作者:
Sang-Heon Shim
Sang-Heon Shim的其他文献
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
{{ truncateString('Sang-Heon Shim', 18)}}的其他基金
EA: Upgrade of the Laser Heating System in the High-Pressure Diamond-Anvil Cell Laboratory at Arizona State University
EA:亚利桑那州立大学高压金刚石砧室实验室激光加热系统升级
- 批准号:
2335071 - 财政年份:2024
- 资助金额:
$ 6.94万 - 项目类别:
Standard Grant
Collaborative Research: From Silicate Melts Properties to the Dynamics and Evolution of an Early Basal Magma Ocean
合作研究:从硅酸盐熔体特性到早期基底岩浆洋的动力学和演化
- 批准号:
2153968 - 财政年份:2022
- 资助金额:
$ 6.94万 - 项目类别:
Standard Grant
Upgrade of the Raman Spectroscopy System at the High-Pressure Lab of Arizona State University
亚利桑那州立大学高压实验室拉曼光谱系统升级
- 批准号:
2140416 - 财政年份:2022
- 资助金额:
$ 6.94万 - 项目类别:
Standard Grant
Ingassing of Hydrogen in the Interiors of Sub-Neptunes and Gas Giants
亚海王星和气态巨行星内部的氢气吸收
- 批准号:
2108129 - 财政年份:2021
- 资助金额:
$ 6.94万 - 项目类别:
Continuing Grant
Possible Storage of H2O in Mantle Ca(Ti,Si)O3 Perovskite
地幔 Ca(Ti,Si)O3 钙钛矿中 H2O 的可能储存
- 批准号:
2019565 - 财政年份:2020
- 资助金额:
$ 6.94万 - 项目类别:
Standard Grant
Effect of Hydrogen on the Sulfur-rich Martian Core
氢对富含硫的火星核心的影响
- 批准号:
2005567 - 财政年份:2020
- 资助金额:
$ 6.94万 - 项目类别:
Standard Grant
Effect of Hydrogen on the Properties of Fe alloys in the Earth's Core
氢对地核铁合金性能的影响
- 批准号:
1921298 - 财政年份:2019
- 资助金额:
$ 6.94万 - 项目类别:
Standard Grant
Calcium in Bridgmanite in the Deep Mantle
深部地幔布里奇曼石中的钙
- 批准号:
1725094 - 财政年份:2017
- 资助金额:
$ 6.94万 - 项目类别:
Standard Grant
Understanding the complexity of the 660-km seismic discontinuity
了解 660 公里地震间断面的复杂性
- 批准号:
1316007 - 财政年份:2012
- 资助金额:
$ 6.94万 - 项目类别:
Continuing Grant
The Perovskite to Post-Perovskite Phase Boundary in Mantle Rocks
地幔岩石中的钙钛矿到后钙钛矿相边界
- 批准号:
1301813 - 财政年份:2012
- 资助金额:
$ 6.94万 - 项目类别:
Continuing Grant
相似海外基金
Collaborative Research: CSEDI: Integrating Seismic Anisotropy, Mantle Flow, and Rock Deformation in Subduction Zone Settings
合作研究:CSEDI:在俯冲带环境中整合地震各向异性、地幔流和岩石变形
- 批准号:
2154072 - 财政年份:2022
- 资助金额:
$ 6.94万 - 项目类别:
Continuing Grant
Collaborative Research: CSEDI: Integrating Seismic Anisotropy, Mantle Flow, and Rock Deformation in Subduction Zone Settings
合作研究:CSEDI:在俯冲带环境中整合地震各向异性、地幔流和岩石变形
- 批准号:
2153688 - 财政年份:2022
- 资助金额:
$ 6.94万 - 项目类别:
Continuing Grant
Collaborative Research: CSEDI: Integrating Seismic Anisotropy, Mantle Flow, and Rock Deformation in Subduction Zone Settings
合作研究:CSEDI:在俯冲带环境中整合地震各向异性、地幔流和岩石变形
- 批准号:
2153910 - 财政年份:2022
- 资助金额:
$ 6.94万 - 项目类别:
Continuing Grant
CSEDI Collaborative Research: The nature and timing of Earth's accretion
CSEDI 合作研究:地球吸积的性质和时间
- 批准号:
2054884 - 财政年份:2021
- 资助金额:
$ 6.94万 - 项目类别:
Standard Grant
CSEDI Collaborative Research: The Origins and Implications of Inner Core Seismic Anisotropy
CSEDI合作研究:内核地震各向异性的起源和意义
- 批准号:
2054964 - 财政年份:2021
- 资助金额:
$ 6.94万 - 项目类别:
Continuing Grant
CSEDI Collaborative Research: Understanding of the effects of large planetesimal collisions on Hadean Earth mantle dynamics
CSEDI合作研究:了解大型星子碰撞对冥古宙地幔动力学的影响
- 批准号:
2102571 - 财政年份:2021
- 资助金额:
$ 6.94万 - 项目类别:
Standard Grant
CSEDI Collaborative Research: Understanding of the effects of large planetesimal collisions on Hadean Earth mantle dynamics
CSEDI合作研究:了解大型星子碰撞对冥古宙地幔动力学的影响
- 批准号:
2102777 - 财政年份:2021
- 资助金额:
$ 6.94万 - 项目类别:
Standard Grant
CSEDI Collaborative Research: The nature and timing of Earth's accretion
CSEDI 合作研究:地球吸积的性质和时间
- 批准号:
2054912 - 财政年份:2021
- 资助金额:
$ 6.94万 - 项目类别:
Standard Grant
CSEDI Collaborative Research: The nature and timing of Earth's accretion
CSEDI 合作研究:地球吸积的性质和时间
- 批准号:
2054876 - 财政年份:2021
- 资助金额:
$ 6.94万 - 项目类别:
Standard Grant
CSEDI Collaborative Research: The Origins and Implications of Inner Core Seismic Anisotropy
CSEDI合作研究:内核地震各向异性的起源和意义
- 批准号:
2054993 - 财政年份:2021
- 资助金额:
$ 6.94万 - 项目类别:
Standard Grant